Apparently for the christening of the royal princess, as, apparently for her brother, water from the River Jordan will be flown in.
Apart from the effect of wasteful air travel on the environment, something the child's grandfather makes such a fuss about when he isn't indulging in it himself, there is the aspect of the law.
Water from the Jordan is a lucrative racket indulged on both sides of the river. So Her Majesty, head of the Church, together with the Archbishop of Canterbury, are guilty of conspiring in this crime, which is called simony.
Besides, doesn't the benefit of baptism come from the blessing, rather than the origin or chemical treatment of the water?